The Ri Guy
WKR
You will be fine with the 6-ply.The problem is I want a AT tire with the snowflake symbol and it seems every tire brand only offers 4-ply or 6-ply in 275/55/20 or 275/60/20 with the snowflake and I believe that is the max I can go without leveling.
For a daily-driver and city commuter, you are going to notice increased braking time/distance and likely ~1MPG worse fuel economy going to a 10-ply with more mass at each of your corners.
My Falken's are a 4-ply (SL), granted I'm in a smaller truck, but they have held up to everything just fine and I drive them HARD on both trails and pavement. As a bonus, the Falken's look sweet!